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tech / sci.math / Re: addition of velocities

SubjectAuthor
o Re: addition of velocitiesRobel Vitali

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Re: addition of velocities

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https://www.novabbs.com/tech/article-flat.php?id=114357&group=sci.math#114357

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From: lla...@lrrleieo.ia (Robel Vitali)
Newsgroups: sci.math,sci.physics,sci.physics.relativity
Subject: Re: addition of velocities
Date: Fri, 30 Sep 2022 15:33:32 -0000 (UTC)
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 by: Robel Vitali - Fri, 30 Sep 2022 15:33 UTC

Stan Fultoni wrote:

>> In a frame S , two objects having the respective speeds v1 and v2 have
>> the relative speed equal to v1-v2.
>
> No, that is their closing speed. Their relative speed is
> (v1-v2)/(1-v1v2). Of course, if either v1 or v2 happen to be zero,
> these have the same value (with suitable sign convention).

for resistors in parallel it's (r1·r2)/(r1+r2). Proofs:

https://www.wikihow.com/Solve-Parallel-Circuits#/Image:Solve-Parallel-Circuits-Step-2-Version-3.jpg

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